Exercise $6-9($Algo$)$ Compute and Use the Degree of Operating Leverage $[$LO$6-8]$

Engberg Company installs lawn sod in home yards. The company's most recent monthly contribution format income statement follows:

$\backslash$table$[[,$Amount,$\backslash$table$[[$Percent of$],[$Sales$]]],[$Sales$,$$$84,000,100\%$